I made a patch to allow eager loading to exclude specified columns on the eagerly-loaded models. If you have a model that you want to load for a specific reason -- like, say, you have lots of users, and you want to grab all their posts but exclude the posts' bodies -- you can now specify that by going:
User.find(:all, :include => {:posts => {:except => :body}})
I found this useful in my application when I was trying to grab a huge
amount of emails and didn't want to include their bodies. Without body
loading, the emails loaded in a a few milliseconds: with the bodies included
they took lots longer.
The ticket for this change is here:
https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/3662-exclude-fields-from-eager-loaded-models
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